What really strikes me about this helmet is how much the shape resembles the cavalry helmets of the era. The shape of this helmet is closer to the original Russian leather spiked helmets, which were of the type used in the Crimean War - and which are closer in shape to the British Home Service helmet.

Thank you for posting. This really highlights the original shape of the Prussian spiked helmets.

It seems to me that some elements on this helmet are not from that early period of wear: the "modern" officer cockade (1880-1890), some modern nuts at the inside, the nuts of the chinscales...
I am also wondering that the Wappen is fixed on the shell with loops and leather wedges....It should have screw posts...The wings of the eagle should not lay on the Colberg Bandeau....

Good points to mention..... I had noticed the modern steel hex nut but thought that was acceptable due to the age of the helmet. The other things, I had not picked up on. I have only handled one of these and that was on a visit to Tony S's a few years back so I really have no detailed knowledge of 1842 haube characteristics.